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LG 42LC55 board No EAY38640201 Backlight flashover, any help appreciated

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rubbishrat:
Many thanks to all who replied, a quick update, I have replaced all electrolytics (19 of them) but no change in symptoms. set shuts down before I can properly check lt rails but I haven't found anything bad so far. I disconnected the speakers and watched in darkness but the lower ht lead leaks to chassis both ends where it enters the steel channel and where it exits. Set shuts down in about 1 sec.  Overvoltage seems to be the answer, I will keep looking and post further news if any. Thanks again, Pete.

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